Weight painting causing animation issues in UE4, unsure how to fix
When you're satisfied with the weight paint in Blender, in weight paint mode go to weight menu and use &quot;Normalize all&quot;, and &quot;Limit total&quot; to 4 before exporting.
Blender accept all weight values and do an automatic normalization when some vertices sum more or less than 1.0 of total weight; exporting a non normalized paint can result in different weight ratios.
Limit total is necessary for Unity, maybe Unreal also has this limitation.